JavaFX - 如何退出应用程序

import javafx.application.Application;
import javafx.application.Platform;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class Main extends Application {
  public static void main(String[] args) {
    Application.launch(args);
  }

  @Override
  public void start(Stage stage) {
    Button exitBtn = new Button("Exit");
    exitBtn.setOnAction(e -> Platform.exit());
    
    
    VBox root = new VBox();
    root.getChildren().add(exitBtn);

    Scene scene = new Scene(root, 300, 50);
    stage.setScene(scene);
    stage.setTitle("Hello JavaFX Application with a Scene");
    stage.show();
  }
}